diff --git a/.github/workflows/cron-sync-bcny-forks.yml b/.github/workflows/cron-sync-bcny-forks.yml
index 026f0f4..d089448 100644
--- a/.github/workflows/cron-sync-bcny-forks.yml
+++ b/.github/workflows/cron-sync-bcny-forks.yml
@@ -8,37 +8,54 @@ on:
   workflow_dispatch:
 
 jobs:
+  token:
+    runs-on: ubuntu-latest
+    outputs:
+      token: ${{ steps.token.outputs.token }}
+    steps:
+      - uses: actions/create-github-app-token@v1
+        id: token
+        with:
+          app-id: ${{ secrets.FORK_SYNCER_APP_ID }}
+          private-key: ${{ secrets.FORK_SYNCER_PRIVATE_KEY }}
+          owner: ${{ github.repository_owner }}
 
   sync_analytics_swift:
+    needs: [token]
     name: "Sync thebrowsercompany/analytics-swift"
     runs-on: ubuntu-latest
     steps:
-      - uses: thebrowsercompany/gha-sync-fork@bd704c61db9000e8bbc1affe3d4199b7e3eb291c
+      - uses: thebrowsercompany/gha-sync-fork@73f382706ed07f29b97b055031e69e7beb6c1795
         with:
           fork_repo: thebrowsercompany/analytics-swift
           fork_branch: develop
           upstream_repo: segmentio/analytics-swift
           upstream_branch: main
+          token: ${{ needs.token.outputs.token }}
 
   sync_firebase_cpp_sdk:
+    needs: [token]
     name: "Sync thebrowsercompany/firebase-cpp-sdk"
     runs-on: ubuntu-latest
     steps:
-      - uses: thebrowsercompany/gha-sync-fork@bd704c61db9000e8bbc1affe3d4199b7e3eb291c
+      - uses: thebrowsercompany/gha-sync-fork@73f382706ed07f29b97b055031e69e7beb6c1795
         with:
           fork_repo: thebrowsercompany/firebase-cpp-sdk
           fork_branch: compnerd/swift
           upstream_repo: firebase/firebase-cpp-sdk
           upstream_branch: main
+          token: ${{ needs.token.outputs.token }}
 
   sync_swift_eventsource:
+    needs: [token]
     name: "Sync thebrowsercompany/swift-eventsource"
     runs-on: ubuntu-latest
     steps:
-      - uses: thebrowsercompany/gha-sync-fork@bd704c61db9000e8bbc1affe3d4199b7e3eb291c
+      - uses: thebrowsercompany/gha-sync-fork@73f382706ed07f29b97b055031e69e7beb6c1795
         with:
           fork_repo: thebrowsercompany/swift-eventsource
           fork_branch: main-bcny
           upstream_repo: launchdarkly/swift-eventsource
           upstream_branch: main
+          token: ${{ needs.token.outputs.token }}
 
diff --git a/action.yml b/action.yml
index 0c6dffc..fefa891 100644
--- a/action.yml
+++ b/action.yml
@@ -29,6 +29,10 @@ inputs:
     required: false
     default: false
 
+  token:
+    description: Authentication token to use for Git commands
+    required: false
+
 runs:
   using: composite
   steps:
@@ -39,6 +43,7 @@ runs:
         # Fetch all commits from the fork to prevent arbitrary merge conflicts.
         fetch-depth: 0
         path: ${{ github.workspace }}/fork
+        token: ${{ inputs.token || github.token }}
 
     - name: Rebase onto upstream
       shell: pwsh